'A good favour done to a fellow believer is not considered complete until accompanied by three things: underestimation of the act, concealing it, and hastening its completion. He who underestimates his good turn to a fellow believer has esteemed his brother highly indeed, whereas he who esteems his good turn to be great has deemed his brother to be insignificant. He who conceals the good turn that he has done has honoured his action, and he who hastens to fulfil his promise takes pleasure in the gift too.'